1. Department of Gastrointestinal and Colorectal Surgery, China-Japan Union Hospital, Jilin University, Changchun, Jilin Province, China
2. Department of Oncology and Hematology Surgery, China-Japan Union Hospital, Changchun, Jilin Province, China
3. Department of Colorectal Surgery, Jilin Province People’s Hospital, Changchun, Jilin Province, China
4. Anorectal Surgery, Siping Central People’s Hospital, Jilin University, Siping, Jilin Province, China
5. Emergency Department, Tonghua Central Hospital, Jilin University, Tonghua, Jilin Province, China
6. Department of Gastrointestinal Surgery, Shengli Oilfield Central Hospital, Dongying, Jilin Province, China